package org.more.util.map;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.util.HashMap;
/***
 * 以下代码来自JDK1.6_20
 * @version : 2012-2-28
 */
public class Properties extends HashMap<String, String> {
    private static final long serialVersionUID = -3228374271859460180L;
    /**
     * Reads a property list (key and element pairs) from the input
     * character stream in a simple line-oriented format.
     * <p>
     * Properties are processed in terms of lines. There are two
     * kinds of line, <i>natural lines</i> and <i>logical lines</i>.
     * A natural line is defined as a line of
     * characters that is terminated either by a set of line terminator
     * characters (<code>\n</code> or <code>\r</code> or <code>\r\n</code>)
     * or by the end of the stream. A natural line may be either a blank line,
     * a comment line, or hold all or some of a key-element pair. A logical
     * line holds all the data of a key-element pair, which may be spread
     * out across several adjacent natural lines by escaping
     * the line terminator sequence with a backslash character
     * <code>\</code>.  Note that a comment line cannot be extended
     * in this manner; every natural line that is a comment must have
     * its own comment indicator, as described below. Lines are read from
     * input until the end of the stream is reached.
     *
     * <p>
     * A natural line that contains only white space characters is
     * considered blank and is ignored.  A comment line has an ASCII
     * <code>'#'</code> or <code>'!'</code> as its first non-white
     * space character; comment lines are also ignored and do not
     * encode key-element information.  In addition to line
     * terminators, this format considers the characters space
     * (<code>' '</code>, <code>'&#92;u0020'</code>), tab
     * (<code>'\t'</code>, <code>'&#92;u0009'</code>), and form feed
     * (<code>'\f'</code>, <code>'&#92;u000C'</code>) to be white
     * space.
     *
     * <p>
     * If a logical line is spread across several natural lines, the
     * backslash escaping the line terminator sequence, the line
     * terminator sequence, and any white space at the start of the
     * following line have no affect on the key or element values.
     * The remainder of the discussion of key and element parsing
     * (when loading) will assume all the characters constituting
     * the key and element appear on a single natural line after
     * line continuation characters have been removed.  Note that
     * it is <i>not</i> sufficient to only examine the character
     * preceding a line terminator sequence to decide if the line
     * terminator is escaped; there must be an odd number of
     * contiguous backslashes for the line terminator to be escaped.
     * Since the input is processed from left to right, a
     * non-zero even number of 2<i>n</i> contiguous backslashes
     * before a line terminator (or elsewhere) encodes <i>n</i>
     * backslashes after escape processing.
     *
     * <p>
     * The key contains all of the characters in the line starting
     * with the first non-white space character and up to, but not
     * including, the first unescaped <code>'='</code>,
     * <code>':'</code>, or white space character other than a line
     * terminator. All of these key termination characters may be
     * included in the key by escaping them with a preceding backslash
     * character; for example,<p>
     *
     * <code>\:\=</code><p>
     *
     * would be the two-character key <code>":="</code>.  Line
     * terminator characters can be included using <code>\r</code> and
     * <code>\n</code> escape sequences.  Any white space after the
     * key is skipped; if the first non-white space character after
     * the key is <code>'='</code> or <code>':'</code>, then it is
     * ignored and any white space characters after it are also
     * skipped.  All remaining characters on the line become part of
     * the associated element string; if there are no remaining
     * characters, the element is the empty string
     * <code>&quot;&quot;</code>.  Once the raw character sequences
     * constituting the key and element are identified, escape
     * processing is performed as described above.
     *
     * <p>
     * As an example, each of the following three lines specifies the key
     * <code>"Truth"</code> and the associated element value
     * <code>"Beauty"</code>:
     * <p>
     * <pre>
     * Truth = Beauty
     *  Truth:Beauty
     * Truth            :Beauty
     * </pre>
     * As another example, the following three lines specify a single
     * property:
     * <p>
     * <pre>
     * fruits                           apple, banana, pear, \
     *                                  cantaloupe, watermelon, \
     *                                  kiwi, mango
     * </pre>
     * The key is <code>"fruits"</code> and the associated element is:
     * <p>
     * <pre>"apple, banana, pear, cantaloupe, watermelon, kiwi, mango"</pre>
     * Note that a space appears before each <code>\</code> so that a space
     * will appear after each comma in the final result; the <code>\</code>,
     * line terminator, and leading white space on the continuation line are
     * merely discarded and are <i>not</i> replaced by one or more other
     * characters.
     * <p>
     * As a third example, the line:
     * <p>
     * <pre>cheeses
     * </pre>
     * specifies that the key is <code>"cheeses"</code> and the associated
     * element is the empty string <code>""</code>.<p>
     * <p>
     *
     * <a name="unicodeescapes"></a>
     * Characters in keys and elements can be represented in escape
     * sequences similar to those used for character and string literals
     * (see <a
     * href="http://java.sun.com/docs/books/jls/third_edition/html/lexical.html#3.3">&sect;3.3</a>
     * and <a
     * href="http://java.sun.com/docs/books/jls/third_edition/html/lexical.html#3.10.6">&sect;3.10.6</a>
     * of the <i>Java Language Specification</i>).
     *
     * The differences from the character escape sequences and Unicode
     * escapes used for characters and strings are:
     *
     * <ul>
     * <li> Octal escapes are not recognized.
     *
     * <li> The character sequence <code>\b</code> does <i>not</i>
     * represent a backspace character.
     *
     * <li> The method does not treat a backslash character,
     * <code>\</code>, before a non-valid escape character as an
     * error; the backslash is silently dropped.  For example, in a
     * Java string the sequence <code>"\z"</code> would cause a
     * compile time error.  In contrast, this method silently drops
     * the backslash.  Therefore, this method treats the two character
     * sequence <code>"\b"</code> as equivalent to the single
     * character <code>'b'</code>.
     *
     * <li> Escapes are not necessary for single and double quotes;
     * however, by the rule above, single and double quote characters
     * preceded by a backslash still yield single and double quote
     * characters, respectively.
     *
     * <li> Only a single 'u' character is allowed in a Uniocde escape
     * sequence.
     *
     * </ul>
     * <p>
     * The specified stream remains open after this method returns.
     *
     * @param   reader   the input character stream.
     * @throws IOException  if an error occurred when reading from the
     *          input stream.
     * @throws IllegalArgumentException if a malformed Unicode escape
     *          appears in the input.
     * @since 1.6
     */
    public synchronized void load(final Reader reader) throws IOException {
        this.load0(new LineReader(reader));
    }
    /**
     * Reads a property list (key and element pairs) from the input
     * byte stream. The input stream is in a simple line-oriented
     * format as specified in
     * {@link #load(java.io.Reader) load(Reader)} and is assumed to use
     * the ISO 8859-1 character encoding; that is each byte is one Latin1
     * character. Characters not in Latin1, and certain special characters,
     * are represented in keys and elements using
     * <a href="http://java.sun.com/docs/books/jls/third_edition/html/lexical.html#3.3">Unicode escapes</a>.
     * <p>
     * The specified stream remains open after this method returns.
     *
     * @param      inStream   the input stream.
     * @exception IOException  if an error occurred when reading from the
     *             input stream.
     * @throws IllegalArgumentException if the input stream contains a
     *         malformed Unicode escape sequence.
     * @since 1.2
     */
    public synchronized void load(final InputStream inStream) throws IOException {
        this.load0(new LineReader(inStream));
    }
    private void load0(final LineReader lr) throws IOException {
        char[] convtBuf = new char[1024];
        int limit;
        int keyLen;
        int valueStart;
        char c;
        boolean hasSep;
        boolean precedingBackslash;
        while ((limit = lr.readLine()) >= 0) {
            c = 0;
            keyLen = 0;
            valueStart = limit;
            hasSep = false;
            //System.out.println("line=<" + new String(lineBuf, 0, limit) + ">");
            precedingBackslash = false;
            while (keyLen < limit) {
                c = lr.lineBuf[keyLen];
                //need check if escaped.
                if ((c == '=' || c == ':') && !precedingBackslash) {
                    valueStart = keyLen + 1;
                    hasSep = true;
                    break;
                } else if ((c == ' ' || c == '\t' || c == '\f') && !precedingBackslash) {
                    valueStart = keyLen + 1;
                    break;
                }
                if (c == '\\') {
                    precedingBackslash = !precedingBackslash;
                } else {
                    precedingBackslash = false;
                }
                keyLen++;
            }
            while (valueStart < limit) {
                c = lr.lineBuf[valueStart];
                if (c != ' ' && c != '\t' && c != '\f') {
                    if (!hasSep && (c == '=' || c == ':')) {
                        hasSep = true;
                    } else {
                        break;
                    }
                }
                valueStart++;
            }
            String key = this.loadConvert(lr.lineBuf, 0, keyLen, convtBuf);
            String value = this.loadConvert(lr.lineBuf, valueStart, limit - valueStart, convtBuf);
            this.put(key, value);
        }
    }
    /*
     * Converts encoded &#92;uxxxx to unicode chars
     * and changes special saved chars to their original forms
     */
    private String loadConvert(final char[] in, int off, final int len, char[] convtBuf) {
        if (convtBuf.length < len) {
            int newLen = len * 2;
            if (newLen < 0) {
                newLen = Integer.MAX_VALUE;
            }
            convtBuf = new char[newLen];
        }
        char aChar;
        char[] out = convtBuf;
        int outLen = 0;
        int end = off + len;
        while (off < end) {
            aChar = in[off++];
            if (aChar == '\\') {
                aChar = in[off++];
                if (aChar == 'u') {
                    // Read the xxxx
                    int value = 0;
                    for (int i = 0; i < 4; i++) {
                        aChar = in[off++];
                        switch (aChar) {
                        case '0':
                        case '1':
                        case '2':
                        case '3':
                        case '4':
                        case '5':
                        case '6':
                        case '7':
                        case '8':
                        case '9':
                            value = (value << 4) + aChar - '0';
                            break;
                        case 'a':
                        case 'b':
                        case 'c':
                        case 'd':
                        case 'e':
                        case 'f':
                            value = (value << 4) + 10 + aChar - 'a';
                            break;
                        case 'A':
                        case 'B':
                        case 'C':
                        case 'D':
                        case 'E':
                        case 'F':
                            value = (value << 4) + 10 + aChar - 'A';
                            break;
                        default:
                            throw new IllegalArgumentException("Malformed \\uxxxx encoding.");
                        }
                    }
                    out[outLen++] = (char) value;
                } else {
                    if (aChar == 't') {
                        aChar = '\t';
                    } else if (aChar == 'r') {
                        aChar = '\r';
                    } else if (aChar == 'n') {
                        aChar = '\n';
                    } else if (aChar == 'f') {
                        aChar = '\f';
                    }
                    out[outLen++] = aChar;
                }
            } else {
                out[outLen++] = aChar;
            }
        }
        return new String(out, 0, outLen);
    }
    /* Read in a "logical line" from an InputStream/Reader, skip all comment
     * and blank lines and filter out those leading whitespace characters 
     * (\u0020, \u0009 and \u000c) from the beginning of a "natural line". 
     * Method returns the char length of the "logical line" and stores 
     * the line in "lineBuf". 
     */
    class LineReader {
        public LineReader(final InputStream inStream) {
            this.inStream = inStream;
            this.inByteBuf = new byte[8192];
        }
        public LineReader(final Reader reader) {
            this.reader = reader;
            this.inCharBuf = new char[8192];
        }
        byte[] inByteBuf;
        char[] inCharBuf;
        char[] lineBuf = new char[1024];
        int    inLimit = 0;
        int    inOff   = 0;
        InputStream inStream;
        Reader      reader;
        int readLine() throws IOException {
            int len = 0;
            char c = 0;
            boolean skipWhiteSpace = true;
            boolean isCommentLine = false;
            boolean isNewLine = true;
            boolean appendedLineBegin = false;
            boolean precedingBackslash = false;
            boolean skipLF = false;
            while (true) {
                if (this.inOff >= this.inLimit) {
                    this.inLimit = this.inStream == null ? this.reader.read(this.inCharBuf) : this.inStream.read(this.inByteBuf);
                    this.inOff = 0;
                    if (this.inLimit <= 0) {
                        if (len == 0 || isCommentLine) {
                            return -1;
                        }
                        return len;
                    }
                }
                if (this.inStream != null) {
                    //The line below is equivalent to calling a 
                    //ISO8859-1 decoder.
                    c = (char) (0xff & this.inByteBuf[this.inOff++]);
                } else {
                    c = this.inCharBuf[this.inOff++];
                }
                if (skipLF) {
                    skipLF = false;
                    if (c == '\n') {
                        continue;
                    }
                }
                if (skipWhiteSpace) {
                    if (c == ' ' || c == '\t' || c == '\f') {
                        continue;
                    }
                    if (!appendedLineBegin && (c == '\r' || c == '\n')) {
                        continue;
                    }
                    skipWhiteSpace = false;
                    appendedLineBegin = false;
                }
                if (isNewLine) {
                    isNewLine = false;
                    if (c == '#' || c == '!') {
                        isCommentLine = true;
                        continue;
                    }
                }
                if (c != '\n' && c != '\r') {
                    this.lineBuf[len++] = c;
                    if (len == this.lineBuf.length) {
                        int newLength = this.lineBuf.length * 2;
                        if (newLength < 0) {
                            newLength = Integer.MAX_VALUE;
                        }
                        char[] buf = new char[newLength];
                        System.arraycopy(this.lineBuf, 0, buf, 0, this.lineBuf.length);
                        this.lineBuf = buf;
                    }
                    //flip the preceding backslash flag
                    if (c == '\\') {
                        precedingBackslash = !precedingBackslash;
                    } else {
                        precedingBackslash = false;
                    }
                } else {
                    // reached EOL
                    if (isCommentLine || len == 0) {
                        isCommentLine = false;
                        isNewLine = true;
                        skipWhiteSpace = true;
                        len = 0;
                        continue;
                    }
                    if (this.inOff >= this.inLimit) {
                        this.inLimit = this.inStream == null ? this.reader.read(this.inCharBuf) : this.inStream.read(this.inByteBuf);
                        this.inOff = 0;
                        if (this.inLimit <= 0) {
                            return len;
                        }
                    }
                    if (precedingBackslash) {
                        len -= 1;
                        //skip the leading whitespace characters in following line
                        skipWhiteSpace = true;
                        appendedLineBegin = true;
                        precedingBackslash = false;
                        if (c == '\r') {
                            skipLF = true;
                        }
                    } else {
                        return len;
                    }
                }
            }
        }
    }
}